12．Since nobody gave him any help，he       have done the research on his own．（　�。�
A．canB．mustC．wouldD．need

分析 句意：由于沒(méi)有人給他任何幫助，他肯定獨(dú)立完成研究的．

解答 答案B．can have done sth可能已經(jīng)做了某事；must have done sth一定已經(jīng)做了某事；would have done表示與過(guò)去事實(shí)相反；need have done 本來(lái)需要做某事．根據(jù)句意：由于沒(méi)有人給他任何幫助，他"肯定"獨(dú)立完成研究． 故選B．

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞+have done 的用法，解題時(shí)要聯(lián)系上下文的語(yǔ)境．

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Why it’s a great choice: Thailand is known for its friendly atmosphere, and as a travel hot-spot, there are plenty of chances to meet other like-minded travelers. It is well known for being very cheap, especially in the north. It is a good choice if you want to get away on a budget. Thailand has a lot to offer, from the party-central Bangkok to beautiful beaches and tropical（熱帶）jungle.

Hong Kong, China

Hong Kong is a great place to relax for solo travelers as it is full of “Zen moments,” such as beautiful gardens and Tai Chi classes.

Why it’s a great choice: Hong Kong is regarded as one of the safest cities in the world. If you’re not well-traveled, or perhaps a bit tired of things like language barriers, Hong Kong is a great place to start, as it mixes both Eastern and Western at the same time.

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